Recommendations for cloud based file storage service with Python API?

[python at bdurham.com]

I'm looking for recommendations on a cloud based file storage
service with a Python API.

Would appreciate hearing feedback from anyone using Python to
interface to Amazon S3, RackSpace Cloud Files, Microsoft Azure,
Rsync.net, or other hosted file storage service. What services do
you recommend or suggest we avoid? Are there Python specific
issues (such as lagging library updates when an API gets updated)
I should be concerned about?

Our use case is mananging thousands of 100K-500K data files owned
by hundreds of users.

Thank you,
Malcolm
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